Effect of Different polyols on the Polyurethane-Isocyanate Microcapsules for Self-healing Coatings

Microcapsules containing isophorene diisocyanate (IPDI) for use in self-healing polymers were successfully fabricated via interfacial polymerization of polyurethane (PU). Microcapsules were manufactured by using different polyols including 1,4-butandiol, 1,6-hexanediol and glycerol. The preparation of PU prepolymer and microencapsulation of IPDI healing agent were proved by Fourier Transform Infra-Red (FTIR) and Thermo-Gravimetric Analysis (TGA). High yields of a powder of IPDI/PU microcapsules are prepared by using 1,4-butandiol and 1,6-hexanediol as polyol monomers as determined by TGA. Scanning Electron Microscope (SEM) was shown smooth spherical microcapsules of 1.7 and 3 μm in diameter were produced by using 1,4-butandiol and 1,6-hexanediol as polyol, receptively